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Each key that is listed as missing needs to be added to the apt key manager so that it can authenticate the packages. Sometimes the system does not have all the keys it needs and runs into this issue. The apt packaging system has a set of trusted keys that determine whether a package can be authenticated and therefore trusted to be installed on the system. For example: $ sudo apt-get upgradeĮ: Some packages could not be authenticated If these errors aren’t fixed, apt will have problems when installing or upgrading packages. W: GPG error: trusty-updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32 W: GPG error: trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32 W: GPG error: trusty-security Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32

I have been able to help people that are new to Ubuntu Mate figure out how to use their new operating system without having to leave my house.There are times when running apt-get update in Ubuntu will result in error messages such as the following: $ sudo apt-get update I have repaired computers online via the help of TeamViewer. After downloading and installing this software, you’ll have your first session up and running within seconds." Collaborate online, participate in meetings, chat with other people or groups, and make video calls in one-click. "Establish incoming and outgoing remote desktop and computer-to-computer connections for real-time support or access to files, networks and programs. Just make sure you trust the person you are connecting to your computer. TeamViewer allows you to safely connect your computer to someone else's computer online to receive remote support or just collaborate online. ​If you are new to Ubuntu MATE and you need help figuring out how to use the operating system or if you think you messed up something and you need help fixing it, then TeamViewer might be the software for you.